Sand blowing head for core machines



April 12, 1955 A p so 2,705,821

SAND BLOWING HEAD FOR CORE MACHINES Filed May 3, 1951 2 Sheets-Sheet 1 IN VEN TOR.

@265 H Pei'enson April 12, 1955 A. H. PETERSON 2,705,821

SAND BLOWING HEAD FOR CORE MACHINES Filed lay 3, 1951 2 Sheets-Sheet 2 INVENTOR.

Wzl Pszianson United States Patent SAND BLOWING HEAD FOR CORE MACHINES Axel H. Peterson, Rock Island, Ill.

Application May 3, 1951, Serial No. 224,392

2 Claims. (Cl. 22-36) This invention relates to a sand blowing head for use in making sand cores in a core making machine.

More specifically, the invention is directed to a separable head structure including a quick change blow plate arrangement.

One of the main objects of the present invention is to provide a sand blowing head that is divisible intermediate its length through quick change fastening means to interchangeably provide a working end of predetermined internal contour to direct and distribute sand over a blow plate having a given shape to thus supply sand to core boxes of certain sizes and outlines.

Another object of the present invention is to provide the working or sand discharge end of the sand blowing head with quick release holding mechanism to secure a blow plate to the head in a predetermined relation with respect thereto and for contact with a core box.

Another object of the present invention is to provide cooperative means, as part of the holding mechanism, which means not only function to secure the blow plate to the discharge end of the head, but which also function to urge the plate into airtight contact with the adjacent plate receiving surface of the head.

Further objects of this invention include means carried by the blow plate to preposition a core box in a given relation upon a table or support to occupy a selected position with respect to the particular blow plate in use for directing core sand into such core box; and also to provide blow plates having symmetrical design for use with either face up and also end for end if desired.

Other objects and advantages relating to this invention shall hereinafter appear in the following detailed description having reference to the accompanying drawings forming a part of this specification.

In the drawings:

Fig. l is a front elevational view of a core making machine incorporating the sand blowing head of the present invention;

Fig. 2 is a vertical cross sectional view of a fragmentary portion of the working or discharge end of the sand blowing head;

Fig. 3 is a plan view of said head as viewed substantially along the line 3-3 of Fig. 2;

Fig. 4 is a perspective view of the quick release blow plate illustrated in Figs. 2 and 3;

Fig. 5 is an enlarged detail sectional view of a portion of the blow plate and one end of one of the plate holding mechanisms; and

Fig. 6 is a side elevational view of the sand head with a difierent sand feeding end and discharging blow plate connected therewith.

The core making machine seen in Fig. 1 is of the kind shown and described in my copending application Serial No. 208,565, filed January 30, 1951, wherein the head is expandible under internal air pressure to move downwardly into engagement with a core box supported upon a fixed base or table, the sand blowing occurring after contact with the core box. This invention is not limited to such a machine and may be incorporated into any machine having relatively movable sand head and core box supporting means.

By way of explanation, the machine in Fig. 1 has a base 1 providing a table to support core boxes. Base 1 has threaded uprights or posts 2 and 3, and the sand head 4 has lateral sleeves 5 and 6 slidably carried upon "ice posts 2 and 3, respectively, with sets of lock nuts 7-7 and 8--8 fixing the vertical position of head 4 with respect to base 1. A hopper 9 is for reserve core sand which can be periodically supplied to head 4 through a suitable valve arrangement 10. A hand lever 11 connects with a valve to admit air under pressure to head 4 during operation, and in the construction shown in Fig. 1, head 4 has a movable section 12 connected by flexible means with head 4 to move the working end or blow head 13 and its blow plate 14 into contact with a core box positioned upon base 1, the flexible means being described in my copending application.

Coacting with the blow head 13 are suitable side clamps 15 and 16 for laterally positioning and holding vertically split core boxes upon base 1 and in a given lateral relation with respect to the blow head 13 and blow plate 14. These clamps 15 and 16 are not needed when horizontally split core boxes are being blown, but any suitable gauge means can be employed for laterally centering the latter type of core boxes with respect to the blow head 13 and blow plate 14. Fore and aft gauge means may also be used to preposition core boxes under the head arrangement.

The blow head 13 is provided with a machined top 17 having airtight contact with the head proper, and more specifically with the machined lower end 18 of the head section 12. Section 12 has two or more radial bosses 19 bored out at 20 to loosely receive the threaded shank 21 of a long headed bolt 22 that is easily accessible. The threaded shank 21 threads into a threaded socket 23 in an aligned boss 24 carried by the blow head 12 and by drawing up upon the easily accessible laterally positioned bolt 22, the connected parts are tightly joined for operation but may be easily separated by loosening the bolts 22 at each side of the head structure.

As seen in Figs. 1, 2 and 3, the blow head 13 has a predetermined internal contour beginning with a circular upper end 25 and blending into a long and narrow discharge lower end 26 to direct and distribute sand out of the round head structure over the entire surface of a long and narrow blow plate such as shown in Figs. 2, 3 and 4. If blow plates are to be varied considerably in shape, the blow head 13 can be removed and replaced with a blow head such as 13a shown in Fig. 6 to accommodate a blow plate such as 14a. In either case, plates such as 14 or 14:: can be replaced by plates of like shapes but wherein the arrangement, sizes or number of sand openings 27 or 27a (see Figs. 4 and 6) may be varied to suit certain range groups of core boxes.

The blow plate 14 shown in Figs. 2, 3 and 4 is relatively thick and has conical recesses 28 at spaced points on opposite edges thereof. These recesses are on the horizontal median plane of the plate so that either side of the latter may be used against the discharge end 26 of the blow head 13. By locating the recesses 28 at given locations from each end of the plate 14, the latter may also be equally employed end for end in its association with blow head 13.

Blow head 13 is provided with lugs 29, 30, 31 and 32, with lugs 29 and 31 preferably spaced to the rear of the blow head center the samedistance as lugs 30 and 32 are spaced forwardly of the center. It is also preferable to space lugs 29 and 30 to the left of the center of the blow head 13 as viewed in Fig. 3 the same distance as lugs 31 and 32 are spaced to the right of this center. This specific arrangement contributes to the interchangeable use of a blow plate such as 13, but the arrangement need not necessarily be so limited with respect to the center position of the blow head because bodily displacement of all four lugs is possible and the same results are still obtainable.

The described lugs 31 to 32 flank the opening 33 in the discharge end of the blow head 13 and each of the lugs has a threaded bore 34 to receive a stud 35 having a cone point 36. Plate 14 has smooth machined faces 37 and 38, either of which may be brought into flush contact with the peripherally machined bottom surface 39 of the blow head 13. The axial positions of studs 35 are slightly above the axial position of the plate recesses 28 as best shown in Fig. 5, so that the tightening action of bringing the stud ends into contact with the wall portions of recesses 28 is supplemented by a component cam action between the upper surface portion 40 of the conical stud cone point 36 and the surface 41 in recess 28. This cam action urges plate 14 upwardly against the peripheral head surface 39 to cause an airtight seal while fixedly securing plate 14 to the head by the individual holding mechanisms.

As best shown in Figs. 2 and 3, studs 35 on the right hand side have kerfs 42 cut into the head ends for screw driver adjustments, with lock nuts 43 on said studs engageable with the outer faces of the head lugs 31 and 32. The studs 35 on the left are preferably provided with relatively large hand wheels 44 secured to the studs, and lock nuts 45 hold the studs in plate locking position when the studs are tightened into the plate recesses 28 by means of such hand wheels 44. With this arrangement, the positions of the right hand studs can be adjusted and locked as gauge units to receive the blow plate 14 in a prepositioned relation with respect to the blow head 13, and such plate will therefore always be locked and clamped in such a position by the hand wheels 44 and the lock nuts 45. The hand wheel arrangement facilitates quick change of the plates employed for different conditions of operation as determined by the core box apertures, etc.

In Fig. 6, the plate 14a has upstanding lugs 46 carrying screw studs 47 with suitable lock nuts 48, and the flanged end 49 of the head 13a carries recesses 50 to receive the tapered ends 51 of the studs 47. This construction has the horizontal axes of the studs 47 slightly lower than the horizontal axes of the recesses 50 to cam plate 14a upwardly against the underside of the head 13a while the parts are clamped together by the holding mechanisms.

The blow plates can also be constructed to carry core box positioning gauge means against which a core box may be moved along the top of the base to provide a fore and aft positioning means for under the head 13 or 1311. An example of such a means is illustrated in Figs. 2, 3 and 4. Plate 14 is bored and tapped through at one end as at 52 to receive a threaded shank 53 having a concentric circular head 54 of a given diameter. The head may thus be secured in depending relation to the plate as best seen in Fig. 2 with a core box shown in broken lines at 55. By replacing the stop units with heads of different diameters, the fore and aft limiting positions of the core boxes can be changed in relation to the head 13. Heads such as 54 can be screwed into the threaded bores 52 from either side of the plate 14.

Changes in the exact shapes of the parts and in the combination of parts shown and described may be made without departing from the fundamental concept of the present invention. Such permissible modifications shall, however, be governed by the breadth and scope of the appended claims.

What I claim is:

1. In a core making machine, a core sand delivery structure comprising a sand blowing head having a sand discharge opening flanked by the walls of said head, said walls terminating in smooth coplanar ends surrounding said discharge opening, and a removable apertured blow plate having at least one smooth continuous fiat surface thereon to bodily abut the coplanar ends of said head walls to provide a core sand distribution cover for said head, and adjustable fastening means carried by said head in plate straddling position, said fastening means including clamp mechanism operative to abut the lateral edges of said plate and to releasably position said plate at a predetermined location in three dimensions relative to said head, said clamp mechanism and lateral edges of said plate providing interfitting complementary convergent engaging elements.

2. In a core making machine, a core sand delivery structure comprising a hollow sand blowing head tenninating in a fiat sand discharge end, an apertured plate to provide a sand distribution closure for said discharge end of said head, and securing means to releasably retain said plate against said head and to position the plate fore and aft and laterally in a given relation with respect to said head comprising screw members having convergent ends carried by said head in positions flanking opposite edges of said plate, said screw members being laterally adjustable to position said plate in a given lateral relation with respect to the discharge end of said head, and said plate being provided with convergent spot recesses along the opposite edges thereof for the reception of the convergent ends of said screw members in such recesses whereby to fix the relation of said plate at a predetermined location in three dimensions with respect to said head.

References Cited in the file of this patent UNITED STATES PATENTS 263,448 Withey Aug. 29, 1882 428,422 Skinner May 20, 1890 1,717,325 Ryan June 11, 1929 2,363,463 Pfeifier Nov. 21, 1944 2,556,618 Harrison et a1 June 12, 1951 FOREIGN PATENTS 333,950 Italy Jan. 17, 1936 

